So the rumours were basically correct – the newest Overwatch character is a support sniper, and Pharah’s mother. But one element is missing – she isn’t called Sombra.
The name Sombra has been floating around the Overwatch community for some time – Reaper says the name in a voice line, and it’s written on a file sitting in the Dorado map – and fans are convinced that it will be the name of an as-yet unrevealed character.
After Blizzard released the origins trailer for Ana, the Overwatch subreddit being what it is (obsessive and brilliant) quickly discovered two sets of seemingly coded information hidden in single frames during the video. Once decoded, two sets of letters stood out: "SOMB" and "RA".
Source: IGN PC Articles